Refuting fundamentalists

[Esquilax]

People respond to criticism of the lack of gender balance and "role models" in same-sex adoptive parenting by saying...
oh well we have uncle Bill or cousin Mike involved in their upbringing so they have male role models.

But that merely reinforces the point that such a role model IS valuable if you hope to raise a child who will ''do well" when it comes to Darwinian sexual selection.

And how does the argumentation of single individual cases at all prove a wider, factual point? Do tell.